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The ability to use convenient abbreviations which are not acceptable to the compiler itself: the precompiler expands ("transcribes") the shorthand version into source code which is acceptable to the compiler.

The ability to use non-standard programing statements which are not acceptable to the compiler. Tbis may be done to aid structured programing in a language that is not well suited to it. The added statements are translated into standard language statements (called a "structured programing precompiler").